<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <meta name="viewport" content="width=<device-width>, initial-scale=1.0">
    <title>a网页，负责注册</title>
</head>
<body>
    <h1>我是a网页，负责注册<h1>
    <a href="/index.html">返回</a>  

</body>
</html>